Utilization theory is the basic theory to evaluate forest environmental value.
应以效用论为基础对森林环境价值进行评价。
They have got environmental approval in principle. They have not got full forest clearance.
原则上，他们已经获得了环境许可，但没有获得森林的全权许可证。
Phosphorus stress is often an environmental stress for forest trees.
磷胁迫是森林树木常常遭遇到的逆境。
The forest is also the key to solve the severe environmental problems.
森林也是解决严峻环境问题的关键。
The forest is also the key to solve the severe environmental problems.
森林也是解决严峻环境问题的关键。
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